1. Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
2. Department of Neurology, University of Ulm, Ulm, Germany
3. National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD, USA
4. Department of Neurology, Ruhr University, Bochum, Germany
5. Institute of Clinical Neuroimmunology, Ludwig Maximilian University and Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
6. Department of Neurology, Caritas Hospital, Bad Mergentheim, Germany
7. Clinical Neuroimmunology and Neurochemistry, Department of Neurology, Hanover Medical School, Hanover, Germany
8. Department of Neurology, Johannes Wesling Hospital Minden, Minden, Germany
9. Department of Neurology, Merheim Hospital, Cologne, Germany
10. Department of Neurology, Marienhospital Hamburg, Hamburg, Germany
11. Department of Neurology, University Hospital Wuerzburg, Wuerzburg, Germany
12. MS Center Amsterdam and Department of Radiology, Nuclear Medicine & PET Research, VU University Medical Center, Amsterdam, the Netherlands
13. Department of Pharmacology and Clinical Neuroscience, Umea University Hospital, Umea, Sweden
14. Department of Neurology, Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden
15. Institute for Clinical Chemistry and Laboratory Diagnostics, University Hospital Duesseldorf, Germany
16. Institute for Virology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany